EUP7903
300mA High PSRR LDO Regulators
DESCRIPTION
The EUP7903 is a high current, low-dropout (LDO) linear
regulator with fast transient response and high PSRR. It
offers high output accuracy, extremely low dropout voltage,
low quiescent current and fast start-up time.
The EUP7903 is designed to work with low-ESR ceramic
capacitors, reducing the amount of the PCB area necessary
for power applications. Only a 1uF ceramic output capacitor
can make the device stable over the whole load range.
EUP7903 can be externally set either fixed output mode or
adjustable output mode. Connect FB pin to GND to select
the fixed output mode. Its output is one of pre-set values:
1.25V~5V (50mV per step). Operated in the adjustable mode
when the FB pin is connected to an external resistors divider,
its output can be adjusted from 1.25V to 5V. Other key
features include over-current protection, thermal shutdown.
The device is available in the small SOT23-5 package.
FEATURES
2.5V to 5.5V Input Voltage Range
180mV@300mA Dropout Voltage
Excellent Transient Response
Stable with 1uF Ceramic Output Capacitor
70dB PSRR at 1kHz
Low 90µA Quiescent Current
Low Shutdown Current：<1µA
Output Current Limit
Short Circuit Protection
Output Voltage With High Accuracy:
2% Initial Accuracy
Fixed Output Voltage：1.25V~5V (0.05V step)
Adjustable Output Voltage: 1.25V~5V
Thermal Shutdown
Output Auto-Discharge in Shutdown
RoHS Compliant and 100% Lead (Fb)-Free
APPLICATIONS
Cellular Phones
Bluetooth portable radios and Accessories
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computer
PDAs
Digital still Camera and Video Recorders
Typical Application Circuit
Figure. 1 Adjustable Output
DS7903
Ver 1.0
Nov. 2008
1
EUP7903
Absolute Maximum Ratings (1)
V
IN
,V
EN
--------------------------------------------------------------------------------------------
-0.3V to 6V
V
OUT
-------------------------------------------------------------------------------------- -0.3V to (VIN+0.3V)
Junction Temperature --------------------------------------------------------------------------------
+150℃
Storage Temperature Range ----------------------------------------------------------------- -65℃ to +150℃
Lead Temperature -----------------------------------------------------------------------------------
+260℃
Thermal Resistance
θ
JA
(SOT23-5) ---------------------------------------------------------------
220℃/W
ESD Rating
Human Body Model -------------------------------------------------------------------------
2kV
Recommend Operating Conditions (2)
V
IN
------------------------------------------------------------------------------------------------ 2.5V to 5.5V
V
EN
------------------------------------------------------------------------------------------------
0V to 5.5V
Operating Temperature Range --------------------------------------------------------------- -40℃ to +85℃
Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device.
Note (2): The device is not guaranteed to function outside the recommended operating conditions.
Electrical Characteristics
T
A
=25℃, V
IN
=V
OUT
+1V, or V
IN
=2.5V for V
OUT
<1.5V unless otherwise specified.
Symbol
Parameter
Conditions
EUP7903
Min. Typ. Max.
2.5
5.5
130
1
Unit
V
µA
µA
dB
Input Voltage
V
IN
Input Voltage
I
Q
Quiescent Current
I
SHDN
Shutdown Current
Power Supply Ripple
PSRR
Rejection
V
FB
FB Pin Voltage
Enable
V
ENH
Enable High Voltage
V
ENL
Disable Low Voltage
I
EN
EN Input Current
T
ST
Start-up Time
Output voltage
V
OUT
V
LNR
V
LDR
V
DROP
Output Voltage Accuracy
Output Line Regulation
Output Load Regulation
V
EN
=3.5V, I
OUT
=0mA
V
EN
=0V
V
IN
=V
NOM
+1V
P-P
,f=100Hz,
I
LOAD=
10mA
1.225
Over temperature range
Over temperature range
V
IN
=3.5V, V
EN
=3.5V or 0V
V
IN
=3.5V, V
OUT
=2.5V
V
IN
=V
OUT
+1V, I
OUT
=10mA
V
IN
=V
OUT
+1V, I
OUT
=10mA,
T
A
=-40℃ to +85℃
V
OUT
+0.5V<V
IN
<5.5V, I
OUT
=10mA
1mA < I
OUT
<300mA,
V
IN
=V
NOM
+1.0V
1.5
-1
90
0.1
75
1.25
1.275
V
V
V
µA
µs
%
%
%/V
mV
mV
mA
mA
℃
℃
0.2
40
0.4
1
-2
-3
0.01
10
+2
+3
0.1
16
240
Dropout Voltage (3)
180
I
OUT
=300mA
(Applied for V
OUT
≥2.3V)
I
OUTMAX
Maximum Output Current
300
Protection
IL
IMIT
Current Limit
330
500
T
SD
Thermal Shutdown Temperature No Load, V
IN
=V
EN
=5V
155
T
SDHYS
Thermal Shutdown Hysteresis
No Load, V
IN
=V
EN
=5V
30
Note (3): Dropout is defined as V
IN
-V
OUT
when V
OUT
is 2% below the value of V
OUT
for V
IN
=V
OUT
+0.5V.
DS7903
Ver 1.0
Nov. 2008
5
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